Davis DAV-6420 Käyttöohje

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510

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732-9229 FAX

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510

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670-0589 sales@davisnet.com www.davisnet.com

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465 Diablo Ave., Ha

y

ward, CA 94545-277

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3465 Diablo Ave., Hayward, CA 94545-2778 USA

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t

t

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DS6420 (Rev. F, 11/11/11)

1

Vantage Pro2

TM

Accessories

6420

Leaf Wetness Sensor

For the Wireless Leaf & Soil Moisture/Temperature Station (# 6345)

The Leaf Wetness Sensor detects the presence of surface moisture. The sensor is an artificial-leaf electrical-resistance type. It

consists of a sensing grid, low-voltage bi-polar excitation circuit, and conductivity-sensing circuit. The Vantage Pro2 console

measures the conductivity across the grid and displays the result as a moisture level, scaled from 0 to 15. The user may select the

threshold level at and above which moisture-hour totals are accumulated.

The sensing grid is a gold-plated etched circuit on an epoxy-glass substrate; the excitation and sense circuits are encapsulated in

black epoxy. The included mounting bracket holds the sensor at a 45° angle to simulate a typical leaf position and to permit runoff

of excess moisture; it may be mounted on a vertical post, pipe, or stake, or on the Sensor Mounting Arm.

General

Sensor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Artificial leaf electrical resistance

Excitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bipolar (3V nominal) built-in

Time Constant. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 seconds

Attached Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . 40' (12 m),

Maximum Recommended Cable Extension . . . . . . . . . . . 200' (61 m) using 4-conductor 26 AWG cable

Note: Increasing the cable length above the recommended maximum cable length causes measurement error in the form of lower leaf wetness readings.

Cable Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-conductor, 26 AWG

Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modular connector (RJ-11)

Material

Substrate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Glass-reinforced, ceramic-filled laminate

Grid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 oz. copper, nickel, and 50 µ inch gold plate

Mounting Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . White powder-coated aluminum

Dimensions (length x width x height)

Leaf Wetness Sensor. . . . . . . . . . . . . . . . . . . . . . . . 4.00" x 2.25" x 2.25" (102 mm x 58 mm x 58 mm)

Sensor Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4 in

2

(28 cm

2

)

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 oz. (.4 kg)

Sensor Output

Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 15

Dry/Wet Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . User-selectable

Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 to 54 seconds

Input/Output

Supply Voltage and Current . . . . . . . . . . . . . . . . . . . . . . 100 µA (typical) @ 3 VDC

Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 to 3 VDC

Connections

Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 VDC

Red. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ground

Green . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output

Package Dimensions

Product #

Package Dimensions

(Length x Width x Height)

Package WeightUPC Codes

6420

5.75" x 4.25" x 3.25"

(146 mm x 108 mm x 83 mm)

1.0 lbs. (.5 kg)011698 00238 2

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